Rule: Add form-method-require rule

[coliff]

This pull request introduces a new linting rule to enforce that all <form> elements have a method attribute with a valid value ("get", "post", or "dialog"). The rule is integrated into the core ruleset, tested with various scenarios, and documented for users.

New rule: Require valid method attribute on <form> elements

• Added new rule implementation in form-method-require.ts to check for the presence and validity of the method attribute on <form> elements.
• Registered the new rule in the core rules index (index.ts) and updated the ruleset interface (types.ts) to support configuration. [1] [2]

Testing and documentation

• Created a comprehensive test suite for the new rule covering valid, invalid, and edge cases in form-method-require.spec.js.
• Added user documentation describing the rule, configuration options, examples, and rationale in form-method-require.mdx. (page hidden for now)

Other changes

• Minor formatting adjustments in .editorconfig for consistency.

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Pull Request Overview

This PR introduces a new HTMLHint linting rule form-method-require that enforces all <form> elements to have a valid method attribute. The rule improves form security by preventing sensitive data exposure through default GET methods.

Key changes:

• Implements a new rule to validate form method attributes with accepted values "get", "post", or "dialog"
• Integrates the rule into the core HTMLHint system with proper type definitions and exports
• Provides comprehensive test coverage and user documentation

Reviewed Changes

Copilot reviewed 6 out of 8 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/core/rules/form-method-require.ts	Core rule implementation checking for method attribute presence and validity
src/core/rules/index.ts	Exports the new rule for integration into the rule system
src/core/types.ts	Adds rule configuration option to the Ruleset interface
test/rules/form-method-require.spec.js	Comprehensive test suite covering valid/invalid scenarios
website/src/content/docs/rules/form-method-require.mdx	User documentation with examples and rationale
.editorconfig	Minor formatting cleanup removing blank lines